About Optics & Photonics TopicsOSA Publishing developed the Optics and Photonics Topics to help organize its diverse content more accurately by topic area. This topic browser contains over 2400 terms and is organized in a three-level hierarchy. Read more.

Topics can be refined further in the search results. The Topic facet will reveal the high-level topics associated with the articles returned in the search results.

Abstract

We demonstrate experimentally that bending loss in large mode area photonic crystal fibers oscillates with wavelength. To do so we carried out loss measurements for different fiber bend radii and for different angular orientations. These results confirm the oscillatory behavior of bending loss vs. wavelength as predicted recently by numerical analysis [J. Olszewski et al., Opt. Express 13, 6015 (2005)]. We also found good agreement between our measurement results and our simulations relying on a finite element method with perfectly matched layers and an equivalent index model.

Figures (10)

Fig. 1. Spectral dependence of bending loss (a) for different angular orientations of the fiber with respect to the bending plane (b). Numbers associated to selected loss peaks correspond to the order of the phase matched cladding modes shown in Fig. 2. Calculations were carried out for a bending radius R = 80 mm.

Fig. 2. Distribution of the dominant component of the electric field in selected, y-polarized cladding modes. The calculations were performed for the angular orientations φ= 0° (a). φ= 30° (b) and φ= 15° (c) of the fiber with respect to the bending plane and for radii assuring phase matching condition of respective cladding modes with the fundamental mode, λ = 0.83 μm.

Fig. 4. Schematic diagram illustrating the procedure of angular alignment using an inspection microscope (a). Side view and corresponding diagrams of the fiber cross-sections for different angular orientations with respect to the bending plane (dashed line) (b - d).

Fig. 7. Bending losses measured vs. wavelength for different bending radii. All characteristics are obtained for xz-bending plane. The positions of corresponding primary peaks are marked with black and blue arrows.